* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: #1a1a2e;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 24px;
  font-family: sans-serif;
  color: #e0e0e0;
}

canvas {
  border: 2px solid #0095dd;
  border-radius: 4px;
}

#settings {
  display: flex;
  align-items: center;
  gap: 20px;
  background: #16213e;
  padding: 12px 20px;
  border-radius: 8px;
  border: 1px solid #0f3460;
}

#settings label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 14px;
}

#settings input[type="checkbox"] {
  accent-color: #0095dd;
  width: 16px;
  height: 16px;
  cursor: pointer;
}

#settings select {
  background: #0f3460;
  color: #e0e0e0;
  border: 1px solid #0095dd;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 14px;
  cursor: pointer;
}

#start {
  background: #0095dd;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
}

#start:hover {
  background: #007bb5;
}